Java 7 doesn't have Process.waitFor(time) so use Spock's timeout

dd-smoke-tests/cli/src/test/groovy/datadog/smoketest/CliApplicationSmokeTest.groovy

@@ -1,11 +1,12 @@
 package datadog.smoketest
 
+import spock.lang.Timeout
 
 import java.util.concurrent.TimeUnit
 
 class CliApplicationSmokeTest extends AbstractSmokeTest {
   // Estimate for the amount of time instrumentation, plus request, plus some extra
-  private static final long TIMEOUT_SECS = 10
+  private static final int TIMEOUT_SECS = 10
 
   @Override
   ProcessBuilder createProcessBuilder() {
@@ -19,10 +20,9 @@ class CliApplicationSmokeTest extends AbstractSmokeTest {
     processBuilder.directory(new File(buildDirectory))
   }
 
+  @Timeout(value = TIMEOUT_SECS, unit = TimeUnit.SECONDS)
   def "Cli application process ends before timeout"() {
     expect:
-    assert serverProcess.waitFor(TIMEOUT_SECS, TimeUnit.SECONDS)
-
-    assert serverProcess.exitValue() == 0
+    assert serverProcess.waitFor() == 0
   }
 }